#ifndef _CoherentHierarchicalCullingManager_H__
#define _CoherentHierarchicalCullingManager_H__

#include "CullingManager.h"
#include "HierarchyInterface.h"


namespace GtpVisibility
{

/** Renders the scene with the coherent hierarchical culling algorithm. 
*/
class CoherentHierarchicalCullingManager : public CullingManager
{
public:
	CoherentHierarchicalCullingManager();
	/** Constructor taking the assumed visibility into account, i.e., the estimation
		for how many frames the current visibility is considered to be valid
	*/
	CoherentHierarchicalCullingManager(const unsigned int assumedVisibility);

	void RenderScene();
	/** Sets assumed visibility (i.e., an estimation for 
		how many frames the visibility is considered to be valid).
		@param assumedVisibility indicates for how many frames the 
		same visibility is be assumed.
		if 0, the visibility is tested deterministically for each frame.
	*/
	void SetAssumedVisibility(const unsigned int assumedVisibility);

protected:
	/** Decides if node is considered to be visible depeding on the 
		assumed visibility factor.
		@returns if node is considered to be visible
	*/
	bool DecideVisible(HierarchyNode *node) const;

	unsigned int mAssumedVisibility;
	
	/** Skip query for this node.
	*/
	void SkipQuery(HierarchyNode *node) const;


	/** Threshold for rand function to return positive result with respect to
		mAssumedVisibility.
	*/
	int mThreshold;
};

} // namespace GtpVisibility

#endif // CoherentHierarchicalCullingManager_H